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package org.simpleflatmapper.util;

public class PredicatedEnumerable implements Enumerable {

    private final Enumerable delegate;
    private final Predicate predicate;
 
    public PredicatedEnumerable(Enumerable delegate, Predicate predicate) {
        if (delegate instanceof PredicatedEnumerable) {
            PredicatedEnumerable pe = (PredicatedEnumerable) delegate;
            this.delegate = pe.delegate;
            this.predicate = new AndPredicate(pe.predicate, predicate);
        } else {
            this.delegate = delegate;
            this.predicate = predicate;
        }
    }

    @Override
    public boolean next() {
        while (delegate.next()) {
            if (predicate.test(delegate.currentValue())) {
                return true;
            }
        }
        return false;
    }

    @Override
    public T currentValue() {
        return delegate.currentValue();
    }
}